The proper way to care for a Stella d’Oro daylily is to deadhead the spent flowers, so that it reblooms more profusely, according to About.com. Additionally, it is important to remove brown foliage during late fall.
The individual blooms of Stella d’Oro daylilies typically last one day only, so it is important to remove the spent flowers regularly. This plant is a low-maintenance perennial and does not need to be divided for several years. Gardeners should divide the daylillies if the plants look crowded and seem to be waning in vigor. Division is performed by splitting the plants apart, advisably in fall or early spring.
According to The Garden Helper, daylilies must be grown in full sun to achieve flowers of the best quality. However, these plants also tolerate light shade, particularly in hot climates. They grow best in properly drained soil that is rich in compost and organic matter. They also flourish in slightly acidic soil, with a pH of 6 to 6.5. The Garden Helper recommends thoroughly and deeply watering daylilies with up to an inch of water or more every week. Daylillies planted in sandy soils require more frequent watering. A top-dressing of complete fertilizer, compost and manure helps the plants grow well. New growth must be protected from slugs and snails.